Ceiling lamp



FIG. 1 is a front view of my new design relating to a ceiling lamp, the rear view being identical;

FIG. 2 is a left side view thereof, the right side view being identical;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a three-quarter bottom view in perspective thereof; and,

FIG. 6 is a three-quarter top view in perspective thereof. 

The ornamental design for a ceiling lamp, substantially as shown and described. 